The only bad thing about “Life Could Be a Dream,” the high-spirited musical that opened Thursday at the Avo Playhouse, is the infectious nature of the doo-wop harmonies, which seem to compel some audience members to sing along.

Produced by Moonlight Stage Productions, Roger Bean’s mostly male “Dream” is the sequel to his all-girl “The Marvelous Wonderettes.” But except for its ’50s jukebox harmony quartet theme (and the fact that the characters in both shows graduated from the same high school), the plots are vastly different.

College-age Denny (an ebullient, big-voiced Neil Starkenberg) is an unemployed aspiring singer who lives in his parents’ basement, hoping to score a recording contract with his best friend, drugstore employee Eugene (tenor Clay Stefanki is wiry and nerdy). Piggly Wiggly clerk Wally (bass Richie Ferris is goofy and spastic) soon joins, but their sound doesn’t quite jell until Skip, a smooth-singing car mechanic from the wrong side of town, steps up to sing lead (Nick Tubbs has a sweet voice and a gentle vibe). Problems ensue when Skip falls for Lois (crystal-voiced and likable Michaelia Leigh), the daughter of his boss and sponsor of the vocal group. Skip gets fired and the group splits, but you can bet things will end up dreamy by the end.

Jamie Torcellini’s direction and choreography is tight, polished and professional. Occasionally the acting gets a bit too big for the small Avo theater, but he keeps the characters accessible, the pacing swift and the action dynamic in the two-hour show. Music Director Elan McMahan, who also leads a backstage band, has coached superb harmonies out of the vocal group “Denny and the Dreams” that are so well-tuned and ear-appealing, that apparently you may be tempted to join in.